Developmental assessments require some sort of pre- post- design. If you would like to know how much a student has developed their knowledge, skills, abilities, and/or values, you need to measure that information at the beginning of a learning experience, then again at the end.
Example: One could administer a test at the beginning of a class, then ask the same students to take the same test at the end of a class. By comparing students’ performances on the pre- and post-tests, an instructor could determine students’ levels of development.